Provides a convenient implementation of the ServletRequest interface that
can be subclassed by developers wishing to adapt the request to a Servlet.
This class implements the Wrapper or Decorator pattern. Methods default to
calling through to the wrapped request object.

getParameterMap

an immutable java.util.Map containing parameter names as
keys and parameter values as map values. The keys in the parameter
map are of type String. The values in the parameter map are of type
String array.